do not drink alcohol in excess with cialis. side effects may include headache, upset stomach, delayed backache or muscle ache. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. if you have any sudden decrease or loss in hearing or vision, or if you have any allergic reactions such as rash, hives, swelling of the lips, tongue or throat, or difficulty breathing or swallowing, stop taking cialis and get medical help right away. ask your doctor about cialis for daily use and a 30-tablet free trial. a brand new start. your chance to rise and shine. with centurylink as your trusted technology partner, you can do just that. with our visionary cloud infrastructure, global broadband network and custom communications solutions, your business is more reliable - secure - agile. and with responsive, dedicated support, we help you shine every day of the week.